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Assessment of environmental water requirements for the proposed Basin Plan: Lower Darling River System Published by Murray-Darling Basin Authority Postal Address GPO Box 1801, Canberra ACT 2601 Office location Level 4, 51 Allara Street, Canberra City Australian Capital Territory For further information contact the Murray-Darling Basin Authority office Telephone (02) 6279 0100 international + 61 2 6279 0100 Facsimile (02) 6248 8053 international + 61 2 6248 8053 E-Mail [email protected] Internet http://www.mdba.gov.au MDBA Publication No: 29/12 ISBN: 978-1-922068-37-8 (online) © Murray–Darling Basin Authority for and on behalf of the Commonwealth of Australia, 2012. With the exception of the Commonwealth Coat of Arms, the MDBA logo, all photographs, graphics and trademarks, this publication is provided under a Creative Commons Attribution 3.0 Australia Licence. http://creativecommons.org/licenses/by/3.0/au The MDBA’s preference is that you attribute this publication (and any material sourced from it) using the following wording: Title: Assessment of environmental water requirements for the proposed Basin Plan: Lower Darling River System Source: Licensed from the Murray–Darling Basin Authority, under a Creative Commons Attribution 3.0 Australia Licence. The MDBA provides this information in good faith but to the extent permitted by law, the MDBA and the Commonwealth exclude all liability for adverse consequences arising directly or indirectly from using any information or material contained within this publication. Australian Government Departments and Agencies are required by the Disability Discrimination Act 1992 (Cth) to ensure that information and services can be accessed by people with disabilities. If you encounter accessibility difficulties or the information you require is in a format that you cannot access, please contact us Lower Darling Region Assessment of Lower Darling River System environmental water requirements 1. Introduction The Water Act 2007 (Cwlth) established the Murray‐Darling Basin Authority (MDBA) and tasked it with the preparation of a Basin Plan to provide for the integrated management of the Basin’s water resources. One of the key requirements of the Basin Plan is to establish environmentally sustainable limits on the quantities of surface water that may be taken for consumptive use, termed Sustainable Diversion Limits (SDLs). SDLs are the maximum long‐term annual average volumes of water that can be taken from the Basin and they must represent an Environmentally Sustainable Level of Take (ESLT). The method used to determine the ESLT is described in detail within ‘The proposed “environmentally sustainable level of take” for surface water of the Murray-Darling Basin: Method and Outcomes,’ (MDBA 2011). A summary of the main steps undertaken to determine the ESLT is presented in Figure 1. The assessment of environmental water requirements including specification of site‐specific flow indicators at a subset of hydrologic indicator sites (Step 3 of the overall ESLT method) is the focus of this document. The work described herein is the MDBA’s current understanding of the environmental water requirements of the Lower Darling River System. It is not expected that the environmental water requirements assessments will remain static, rather it is intended that they will evolve over time in response to new knowledge or implementation of environmental watering actions. Within this context, feedback is sought on the material presented within this document whether that be as part of the formal draft Basin Plan consultation phase or during the environmental watering implementation phase within the framework of the Environmental Watering Plan. 1.1 Method to determine site-specific flow indicators Assessment of environmental water requirements for different elements of the flow regime using the hydrologic indicator site approach is one of the key lines of evidence that has informed the proposed SDLs. Effort focussed on regions and parts of the flow regime with greatest sensitivity to the scale of reduction in diversions necessary to achieve environmental objectives, an ESLT and a healthy working Basin. Within the overall framework of the ESLT method (Figure 1) the MDBA used an iterative process to assess environmental water requirements and develop site‐specific flow indicators. The hydrologic indicator site approach uses detailed eco‐hydrological assessment of environmental water requirements for a subset of the key environmental assets and key ecosystem functions across the Basin. Effort focused on high flow (freshes, bankfull flows and overbank flows) requirements reflecting the prioritisation of effort on parts of the flow regime that are most sensitive to the determination of the ESLT and SDLs. The Lower Darling River System is one of the key environmental assets where a detailed assessment of environmental water requirements was undertaken. 1 Figure 1: Outline of method used to determine an Environmentally Sustainable Level of Take. (Source: MDBA 2011). Detailed environmental water requirement assessments lead to the specification of site‐specific flow indicators to achieve site‐specific ecological targets. Flow indicators were expressed at a hydrologic indicator site or sites. Environmental water requirements specified at hydrologic indicator sites are intended to represent the broader environmental flow needs of river valleys or reaches and thus the needs of a broader suite of ecological assets and functions. 2 This report provides a description of the detailed eco‐hydrological assessment of environmental water requirements for the Lower Darling River System including information supporting the development of site‐ specific flow indicators for the site (with reference to flows gauged on the Darling River at Weir 32). More information on how the site‐specific flow indicators for the Lower Darling River System were used within the Basin‐wide modelling process to inform the ESLT (i.e. Step 5 and 6 in Figure 1) can be found in the report ‘Hydrologic modelling to inform the proposed Basin Plan: Methods and results’ (MDBA 2012). A description of the detailed eco‐hydrological assessments of environmental water requirements for other indicator sites are described in other documents in the series ‘Assessment of environmental water requirements for the proposed Basin Plan’. 1.2 Scope and purpose for setting site-specific flow indicators The MDBA’s assessment of environmental water requirements and associated site‐specific flow indicators at hydrologic indicator sites has been used to inform the development of SDLs. This enables the MDBA to estimate the amount of water that will be required by the environment over the long‐term to achieve a healthy working Basin through the use of hydrological models. Accordingly, site‐specific flow indicators are not intended to stipulate future use of environmental water. MDBA expects that the body of work undertaken to establish these site‐specific flow indicators will provide valuable input to environmental watering but this watering will be a flexible and adaptive process guided by the framework of the Environmental Watering Plan and natural eco‐hydrological cues. It will be up to the managers of environmental water, such as the Commonwealth Environmental Water Holder, State Government agencies, and local communities to decide how best to use the available environmental water during any one year to achieve environmental outcomes. 2 Site location and extent The Lower Darling River System hydrologic indicator site is located in south‐western New South Wales at the end of the Darling River, upstream of its junction with the River Murray. It is marked by the towns of Menindee in the north and Wentworth in the south. For the purpose of this report the site is considered to compromise three distinct areas, or management units: the Menindee Lakes in the north, the Darling Anabranch in the west and the Lower Darling River in the east. MDBA has used inundation extents as determined by Kingsford, Thomas and Knowles (1999) to define the lateral and longitudinal extent of the site to the confluence of the River Murray. The Directory of Important Wetlands in Australia dataset (Department of the Environment, Water, Heritage and the Arts 2001) was used to determine internal areas of the site. Spatial data used in Figure 2 is listed in Appendix A. Lake Tandou is excluded from the site because of its agricultural land use. 2.1 Menindee Lakes The Menindee Lakes are located on the Darling River adjacent to the township of Menindee and approximately 110 km east of Broken Hill. The lakes cover an area of around 45,000 ha. The Menindee Lakes storage scheme began in the 1960s and resulted in the construction of a series of small dams, weirs, regulators, channels and levees to contain Darling River floodwaters (NSW Department 3 of Land and Water Conservation 1998). The four main lakes within the Menindee storage — Wetherell, Pamamaroo (including Copi Hollow), Menindee and Cawndilla — have a full storage capacity of 1,731 GL. This amount, however, can be surcharged to 2,050 GL to mitigate adverse impacts of flooding. 2.2 Darling Anabranch The Darling Anabranch covers around 630,000 ha, and can be broken into three components based on their hydrologic nature: • lakes — there are 14 main lakes, including the northern and southern anabranch lakes; • floodplains — although information on the characteristics of these floodplains is limited, they were included in the wetland survey conducted by King and
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